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Physics

Physics
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ?

80 J
336 J
4.2 J
2268 J

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Physics
The quality or tone of a musical sound produced by a stringed instrument depends on

Amplitude of vibration
Wave form of the sound
Length of the strings in the instrument
Frequency of vibration

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Physics
The spring balance works on the principle of ________ .

Pascal's Law
Boyle's Law
Hooke's Law
Bernoulli's principle

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

5R/4
R/2
3R/4
2R

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Physics
Which of the following pair is Incorrect?I. Parsec - DistanceII. Barrel - LiquidIII. Light year - Time

Only I and III
Only II
Only III
All are correct

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Physics
The unit of energy in MKS system is

Joule
Erg
Ohm
Volt

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